Shell Element Modeling
Shell Element Modeling
(OP)
Hi all, I have a few questions regarding modeling:SAP2000V.15
1) When modeling shell elements as a concrete slab, some shell areas shade pink, and others red. What is this implying?
2) I have a large floor plan with many columns. I drew the shell area element blanketing all interior columns. How do I get the program to connect the shell elements to all interior column nodes without redrawing the entire slab and connecting it manually to each column node.
3) It seems when using the POLY area drawing function, sap2000 meshes the slab on its own for analysis. When using the rectangular drawing function, the slab is not meshed after analysis. Is this correct? Will I need to manually mesh the slabs drawn with rectangular area?
Thanks again for the help
Nick
1) When modeling shell elements as a concrete slab, some shell areas shade pink, and others red. What is this implying?
2) I have a large floor plan with many columns. I drew the shell area element blanketing all interior columns. How do I get the program to connect the shell elements to all interior column nodes without redrawing the entire slab and connecting it manually to each column node.
3) It seems when using the POLY area drawing function, sap2000 meshes the slab on its own for analysis. When using the rectangular drawing function, the slab is not meshed after analysis. Is this correct? Will I need to manually mesh the slabs drawn with rectangular area?
Thanks again for the help
Nick





RE: Shell Element Modeling
1) Pink shaded area signifies that local positive 3 axis goes into the page (area is drawn in a clockwise fashion). Red signifies that local positive 3 axis goes out of page (area is drawn in a counter-clockwise fashion).
2) I do not believe so.
3) SAP2000 will only automatically mesh shells drawn with 5 or more nodes.
RE: Shell Element Modeling
It's not true that SAP2000 will only automatically mesh shells drawn with 5 or more nodes. SAP2000 can automesh with 4 node quads or 3 node triangles.
You are correct that the color of area object indicates if whether the normal axis is +3 or -3. You can activate the area local axis using the set display options dialogue. Depending on your version of SAP2000, local axes 1, 2, and 3 will be signified by the color of the arrows red (local 1), green (local 2), blue (local 3). In older versions, SAP uses white instead of green for local 2
RE: Shell Element Modeling
RE: Shell Element Modeling
Why is it that the moment due to slab loads on a beam are so small after analysis, as compared to results obtained in manual analysis?
RE: Shell Element Modeling
If you could provide a little more information about your model it will be easier to attempt an answer. But my first guess is that Your manual analysis doesn't recognize 2-way slab behavior while your finite element model does.
RE: Shell Element Modeling
I however discovered that that when I modified the area load type to 'uniform to beam', the moments matched.
Thank you.
RE: Shell Element Modeling
RE: Shell Element Modeling
RE: Shell Element Modeling